The Solar Chromosphere

Observations of the Sun in H-alpha

This is a series of observations of the Sun in the light of hydrogen (H-alpha at 656.3 nm) made with a small telescope (40mm aperture) and a narrow filter bandpass (~0.06 nm). Technical details of the telescope, filters, camera and observing technique are given on technical details page.

For each day on which observations were made, I show an on-band H-alpha image (haon), usually an off-band image (haoff: to show the continuum) and an active region map (armap) taken from the archive at

Please note that the images are not precisely aligned with the AR Maps. As explained on the technical page, the images are usually taken with an altazimuth mount.